Here are some new discoveries for bands. Most of them are really good if you want a nice mellon collie tune.
1. Augustana
Some good songs are: Boston, Bullets, Stars and Boulevards, Empty Days, and Wasteland
2. Pinback
I found tons of good songs from these guys, it's hard to narrow it down to a couple. Penelope, Fortress, Non-Photo Blue, The Yellow Ones, Tripoli, and Bad Light are some good ones to start out with.
3. The Decemberists
Check out: Clementine, 16 by 32 (It might also be called 16 Military Wives), July! July!, Apology Song, The Engine Driver. They have almost a rough imperfect sound, but they pull it off well.
4. Aqualung
I have the TV show Scrubs to thank for introducing me to this group. Some good songs: Easier to Lie, Brighter than Sunshine, Falling out of Love.
5. Tammany Hall
I only found one song of theirs, but it was well worth the amount of time it took to track down. It's called Cindy.